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SBN-30 ceramics doped stoichiometrically with 1, 3 and 5% of La, i.e. the Sr0.3-3y/2LayBa0.7Nb2O6 system (LSBN) were obtained. The influence of La content and the sintering characteristics were studied by X-ray diffraction (XRD) and thermo-electric analysis (TEA). When the La concentration is 0.05, various reflections XRD shifted to higher angles. The density increases linearly with Ln t, where t is the sintering time and the values of the maximum of permittivity curves rose monotonously with t for I and 3%, with a strong dependence on the porosity. The dynamics, diffusion of the porous respond to a mechanism of D4 type with k(D) = 0.0017 and 0.0016 for 0.01 and 0.03, respectively. For 0.5 a lower decrease of the porosity with sintering time was found, and the maximum values of the permittivity remained constant. The dielectric properties of the ceramic start to deteriorate in this case. (C) 1998 Elsevier Science Limited. Ail rights reserved. |
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